root/ompi/mca/io/romio321/romio/mpi-io/iwrite_sh.c

DEFINITIONS

1. MPI_File_iwrite_shared

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
   2 /* 
   3  *
   4  *   Copyright (C) 1997 University of Chicago. 
   5  *   See COPYRIGHT notice in top-level directory.
   6  */
   7 
   8 #include "mpioimpl.h"
   9 
  10 #ifdef HAVE_WEAK_SYMBOLS
  11 
  12 #if defined(HAVE_PRAGMA_WEAK)
  13 #pragma weak MPI_File_iwrite_shared = PMPI_File_iwrite_shared
  14 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  15 #pragma _HP_SECONDARY_DEF PMPI_File_iwrite_shared MPI_File_iwrite_shared
  16 #elif defined(HAVE_PRAGMA_CRI_DUP)
  17 #pragma _CRI duplicate MPI_File_iwrite_shared as PMPI_File_iwrite_shared
  18 /* end of weak pragmas */
  19 #elif defined(HAVE_WEAK_ATTRIBUTE)
  20 int MPI_File_iwrite_shared(MPI_File fh, const void *buf, int count, MPI_Datatype datatype,
  21                            MPIO_Request *request) __attribute__((weak,alias("PMPI_File_iwrite_shared")));
  22 #endif
  23 
  24 /* Include mapping from MPI->PMPI */
  25 #define MPIO_BUILD_PROFILING
  26 #include "mpioprof.h"
  27 #endif
  28 
  29 /*@
  30     MPI_File_iwrite_shared - Nonblocking write using shared file pointer
  31 
  32 Input Parameters:
  33 . fh - file handle (handle)
  34 . buf - initial address of buffer (choice)
  35 . count - number of elements in buffer (nonnegative integer)
  36 . datatype - datatype of each buffer element (handle)
  37 
  38 Output Parameters:
  39 . request - request object (handle)
  40 
  41 .N fortran
  42 @*/
  43 #ifdef HAVE_MPI_GREQUEST
  44 #include "mpiu_greq.h"
  45 #endif
  46 
  47 int MPI_File_iwrite_shared(MPI_File fh, ROMIO_CONST void *buf, int count,
  48                            MPI_Datatype datatype, MPIO_Request *request)
  49 {
  50     int error_code, buftype_is_contig, filetype_is_contig;
  51     ADIO_File adio_fh;
  52     ADIO_Offset incr, bufsize;
  53     MPI_Count datatype_size;
  54     ADIO_Status status;
  55     ADIO_Offset off, shared_fp;
  56     static char myname[] = "MPI_FILE_IWRITE_SHARED";
  57 
  58     ROMIO_THREAD_CS_ENTER();
  59 
  60     adio_fh = MPIO_File_resolve(fh);
  61 
  62     /* --BEGIN ERROR HANDLING-- */
  63     MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
  64     MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
  65     MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);
  66     /* --END ERROR HANDLING-- */
  67 
  68     MPI_Type_size_x(datatype, &datatype_size);
  69 
  70     /* --BEGIN ERROR HANDLING-- */
  71     MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
  72     MPIO_CHECK_FS_SUPPORTS_SHARED(adio_fh, myname, error_code);
  73     MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
  74     /* --END ERROR HANDLING-- */
  75 
  76     ADIOI_Datatype_iscontig(datatype, &buftype_is_contig);
  77     ADIOI_Datatype_iscontig(adio_fh->filetype, &filetype_is_contig);
  78 
  79     ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);
  80 
  81     incr = (count*datatype_size)/adio_fh->etype_size;
  82     ADIO_Get_shared_fp(adio_fh, incr, &shared_fp, &error_code);
  83     if (error_code != MPI_SUCCESS) {
  84         /* note: ADIO_Get_shared_fp should have set up error code already? */
  85         MPIO_Err_return_file(adio_fh, error_code);
  86     }
  87 
  88     /* contiguous or strided? */
  89     if (buftype_is_contig && filetype_is_contig) {
  90     /* convert sizes to bytes */
  91         bufsize = datatype_size * count;
  92         off = adio_fh->disp + adio_fh->etype_size * shared_fp;
  93         if (!(adio_fh->atomicity))
  94             ADIO_IwriteContig(adio_fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,
  95                             off, request, &error_code); 
  96         else {
  97             /* to maintain strict atomicity semantics with other concurrent
  98               operations, lock (exclusive) and call blocking routine */
  99 
 100             if (adio_fh->file_system != ADIO_NFS)
 101                 ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);
 102 
 103             ADIO_WriteContig(adio_fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,
 104                              off, &status, &error_code);  
 105 
 106             if (adio_fh->file_system != ADIO_NFS)
 107                 ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);
 108 
 109             MPIO_Completed_request_create(&adio_fh, bufsize, &error_code, request);
 110         }
 111     }
 112     else
 113         ADIO_IwriteStrided(adio_fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,
 114                            shared_fp, request, &error_code); 
 115 
 116 fn_exit:
 117     ROMIO_THREAD_CS_EXIT();
 118 
 119     return error_code;
 120 }